To have been loved so deeply even though the person who loved us is gone will give us some protection forever

"Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. He didn't realize that love as powerful as your mother's for you leaves its own mark. Not a scar, no visible sign… to have been loved so deeply, even though the person who loved us is gone, will give us some protection forever." -Albus Dumbledore said to Harry Potter, from Harry Potter and the Sorcerer's Stone, page 299, by J.K. Rowling